The Kubota U48-4 and U55-4 Excavators are advanced zero-tail swing machines designed for professional contractors seeking a balance of power, efficiency, and maneuverability in confined job sites. Built with Kubota’s reliable diesel engines and cutting-edge hydraulic systems, these models deliver strong digging forces, smooth multi-function operation, and durable performance for construction, utilities, and landscaping applications.
The U48-4 features an operating weight of approximately 4.7 tonnes and a 45 hp engine, providing a digging depth of about 3.38 m and a reach of 5.85 m. Compact yet powerful, it is ideal for medium-scale excavation projects. The larger U55-4, at around 5.4 tonnes, shares the same 45 hp powerplant but with extended capacity, offering a deeper dig depth of 3.63 m, a reach of 6.10 m, and breakout forces up to 41.3 kN. Both models utilize Kubota’s load-sensing hydraulic technology, with the U48-4 employing a 1-pump LS system and the U55-4 featuring a 3-pump LS system for enhanced hydraulic efficiency. Auxiliary hydraulic circuits and service ports further increase versatility with attachments.
The workshop repair manual provides comprehensive coverage for both models, including safety instructions, general specifications, engine servicing, hydraulic system operation and diagnostics, and full maintenance procedures. Sections include engine disassembly, pump and control valve service, travel and swivel motor repairs, hydraulic cylinder assembly, and pilot valve functions. The manual also contains detailed wiring diagrams, hydraulic schematics, torque specifications, lubrication intervals, and troubleshooting charts. Cabin-specific service, including air conditioning systems, wipers, lighting, and glass replacement, is also covered to ensure complete support for operators and technicians.
Key Highlights
- Kubota U48-4: ~4.7 t operating weight, 45 hp engine, 3.38 m dig depth, 5.85 m reach, 33.6 kN breakout force
- Kubota U55-4: ~5.4 t operating weight, 45 hp engine, 3.63 m dig depth, 6.10 m reach, 41.3 kN breakout force
- Zero-tail swing design for safe operation in confined job sites
- Load-sensing hydraulics: 1-pump LS system (U48-4), 3-pump LS system (U55-4)
- Auxiliary hydraulic ports and service valves for attachment versatility
- ROPS/TOPS cab options with ergonomic operator controls and available climate control
- Workshop manual includes engine, hydraulics, electrics, swing/travel motors, cab systems, and undercarriage servicing
- Wiring diagrams, hydraulic schematics, torque values, and lubrication charts included
- Detailed troubleshooting guides and flowcharts for accurate diagnostics
- Designed for durability, operator comfort, and long-term reliability in demanding applications
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